The truth is actually even worse than this, as I discovered, when I went through the AA in detail
Agent Grusing really stitched him up!
10 March 21 Barry is confronted with fact that "a tranq dart having been fired “in or around the house.” Barry first admits to the FBI agents that he has used tranq darts on the 2 deer perhaps as recently as "April 2020".
5 April 21 - Barry is first confronted about the evidence of a tranq dart found "inside". Barry confesses to firing such a dart from the breezeway which looked on to where SM was sunbathing .
22 April, 21 Barry admits to disposing of the tranqs (no tranq chemicals recovered from his property). This is the interview where he comes close to confessing SM was tranqed. He says he last used the chemicals late April of 2020. He is confronted with the sheath found in the dryer and says it is nothing to do with him.
28 May 21 In a recorded interview with state police, Barry says he never used the tranqs in Colorado
So you can truly see the lizard brain at work here - played by a maestro.
The lies on 10 March come easy enough, because it's partly based on truth. Grusing knows from Ted Turner that Barry was raising deer for sale in Indiana. But as Barry hasn't sold deer to anyone, he has to pretend he collects the horns. Barry even allows for "darts" to be found - this is highly significant IMO
Barry doesn't know what they found,
but assumes it must be an actual dart, so claims that there are some lying around. Grusing encourages that thinking. No doubt Barry stews in the next days over whether he dropped a dart, and if so where. What is important is he is clearly open to the possibility of the agents finding a spent dart.
The 5 April interview I assume is a moment of pure panic. This is the first time Grusing reveals the dart is actually inside. IMO, with only seconds to think, Barry reveals the shooting location as the place he thinks he most likely dropped it.
This makes some sense IMO, because he must have been considering multiple possibilities and needed to cover all angles. Have the FBI recovered the spent dart, or an unfired one? I believe the spent dart is designed to drop out of the target after a short period. But surely Barry recovered that one and knows where it is... or...? Did he have more than one dart with him? As a backup? Or has he spilled one later somehow during his cleanup? Are the agents bluffing?
22 April is where the trap is sprung.
They never found a dart at all. Rather a tranq needle sheath. In the dryer. They come close to a confession in this interview because he realises they've got him.
It must be a psychologically crushing moment where he realises both how he messed up, and that they know.
(I know this is old hat to some of you, but I wanted to post this for later reference).
Refs
Barry Morphew Redacted Arrest Affidavit – Find Suzanne Morphew